Abstract: A method for controlling a first reference temperature in a device (1) for compressing gas, the device (1) including an oil-injected element (2) for compressing the gas; an oil injection pipe network (6) for injecting oil into the oil-injected element (2), including: an apportioning means (8) for apportioning the oil into a first part and into a second part; an oil cooler (10) cooled by a fan (9), for cooling the first part; and a bypass (11) for diverting the second part past the oil cooler (10). An apportioning proportion of the first part is controlled to a required apportioning proportion, and subsequently a speed of the fan (9) is controlled to a required speed optionally on the basis of the apportioning proportion, wherein the apportioning proportion is controlled by a control unit (15) on the basis of a non-fuzzy logic algorithm.

Abstract: A dryer for compressed gas, including a pressure vessel containing a drying zone and a regeneration zone, a drum within the rotation symmetrical part, equipped with a regenerable drying agent; propulsion unit for rotating the aforementioned drum so that the drying agent is successively conducted through the drying zone and the regeneration zone, an inlet for the supply of the compressed air to be dried to the drying zone, an outlet for the removal of the dried compressed gas, and a first connection line for branching off of a partial stream of the dried compressed gas and transfer of this partial stream to the regeneration zone. The first connection line is equipped with a heating unit for the heating of the partial stream branched off for the regeneration. The first connection line and the heating unit are located within the pressure vessel.

Abstract: A method for optimizing a system for pressurized fluid including a piping network which is provided with an inlet and multiple outlets, subjected to a varying load. The method includes determining minimum pressures (PPOireq) required at the outlets (3); determining a measuring period (?Tm); measuring outlet pressures (PPOi ) during the measuring period (?Tm); calculating corresponding overpressures (OPPOi); finding the minimal overpressure (OPPOimin); finding the smallest minimal overpressure (SMO) occurring in the piping network (1); decreasing the inlet pressure (PIN) with SMO, when SMO>0; and, evaluating other rearrangements when SMO?0.

Abstract: A compressor assembly includes a motor which drives one or more compressor rotors having an oil circulation system including an oil reservoir, an oil cooler and an oil filter, an oil-pump for circulating oil from the oil reservoir to components to be cooled and/or lubricated and back to the oil reservoir wherein the motor has a motor jacket with channels extending in axial directions parallel to the axial direction of a motor shaft in which oil of the oil circulation system circulates.

Abstract: Gear wheel that is provided with spokes (17) which extend between a rim (16) supporting a gear mesh (15) and a corresponding gear hub (18), whereby free spaces (19) are located between the spokes (17) which extend between the rim (16) and the gear hub (18), characterised in that at least one of said free spaces (19) is filled with a block (20) made of a rigid, incompressible material, whereby between the gear wheel (10) on the one hand and the block (20) on the other hand a viscoelastic material (21) is located.

Abstract: A method is provided for detecting and quantifying leaks in a gas network under pressure or vacuum. The gas network may have a sensor(s) capable of recording the status of a source(s), consumers, consumer areas or applications. The method includes: a start-up phase; a training or estimation phase; and an operational phase. The operational phase includes: reading out the first group of sensors; calculating or determining the value of a second group of sensors from the readings from the first group of sensors; comparing the calculated or determined values of the second group of sensors with the read values of the second group of sensors and determining the difference between them; determining, on the basis of a residual value analysis, whether there is a leak in the gas network; generating an alarm and/or generating a leakage rate and/or generating the corresponding leakage cost if a leak is detected.

Abstract: Compressor installation with a liquid-injected compressor device with a compressor element with an outlet pipe connected to an outlet of the compressor element, with a liquid separator in the outlet pipe which includes an inlet and an outlet for compressed gas and an outlet for separated liquid and with a dryer connected to the outlet pipe which uses a desiccant for drying compressed gas of the compressor device. The dryer is provided with a drying section and a regeneration section with an entry and an exit for regeneration gas. A regeneration pipe is connected to the entry and a heat exchanger is provided in the regeneration pipe with a primary section through which the regeneration gas is guided. A secondary section of the heat exchanger is mounted in the compressor device. The compressor installation is provided with means to regulate the amount of liquid injected in the compressor element.

Abstract: Multistage centrifugal compressor provided with a shaft with blades, which is mounted in a housing with bearings. At least one bearing is provided with a bearing damper element including a ring arranged between the shaft and the bearing. The ring includes slots through the thickness of the ring in the axial direction (X-X?) and at a distance from the radially-directed inner and outer surface of the ring. The slots are at least partially overlapping, and: A) the slots are filled with a liquid, and the axial annular surfaces are closed off by means of a protective cap; or: B) at least one of the annular surfaces is provided with a viscoelastic material or hysteretic damping material sandwiched between two concentric discs, which discs are attached to the ring; or: C) the slots are filled with a viscoelastic material.

Abstract: Oil-injected compressor device (1) provided with at least one oil-injected compressor element (2) with an inlet (5) for gas to be compressed and an outlet (7) for compressed gas, whereby the outlet (7) is connected to an oil separator (9), whereby the oil-injected compressor device (1) is further provided with an oil injection pipe (14) leading from the oil separator (9) to the oil-injected compressor element (2), whereby an oil cooler (15) is incorporated into the oil injection pipe (15), characterized in that a storage (17) for oil is provided in the oil injection pipe (14) downstream of an inlet (16) of the oil cooler (15).

Abstract: An element for compressing a gas with a housing (2) which encloses a compression chamber (5) with an outlet port (7) connected to the outlet. A rotor (8) is mounted so that the compression chamber (5) is divided into working chambers. A passage (10) extends between the outlet and a working chamber in the compression chamber (5) which is not in adjacent contact with the outlet port (7). The passage has an overpressure valve (11) to open the passage when a pressure difference between the working chamber and the outlet (4) exceeds a preset value. A valve body (12) encloses a buffer space (13) with a variable volume that is in fluid connection with the outlet through a constriction (14), so the volume is reduced and gas from the buffer space (13) flows through the constriction (14) to the outlet upon opening the passage (10).

Abstract: A method of operating a vacuum pump system, the method including the steps of: operating a primary vacuum pump having a variable speed motor; connecting at least two secondary vacuum pumps in parallel with said primary vacuum pump; dividing the secondary vacuum pumps in groups, each group including at least one secondary vacuum pump; and assigning a priority for each of said groups. The method further includes the steps of measuring the inlet pressure p1, comparing the measured inlet pressure p1 with a predetermined pressure value p0, and if p1 is higher than p0, starting the secondary vacuum pump at a first predetermined startup load Sstartup,1 if it includes a fixed speed motor, and/or starting the secondary vacuum pump at a second predetermined startup load Sstartup,2, if it includes a variable speed motor.

Abstract: A non-lubricated system for pumping a gas, includes a stationary stator with a housing that includes a rotor cavity and at least one rotatable rotor element incorporated within the rotor cavity. The stator includes at least one self-supporting sealing element, incorporated within the rotor cavity between an end face of at least one of the rotor elements and an interior wall of the housing to form a seal along the corresponding end face. At least one self-supporting sealing element is provided with an abradable coating on at least one side facing the rotor.

Abstract: An element for compressing a gas to be compressed at a low temperature of ?40° C. or lower, which element (1) is provided with a housing (2) containing at least one rotor (3) that is rotatably arranged with respect to the housing (2) and having an inlet (6) for the gas to be compressed and an outlet (7) for compressed gas, characterized in that the element (1) is configured for compressing the gas to be compressed having the low temperature by providing the element (1) with a heating duct (8) that runs through the housing (2), the heating duct (8) being provided with an inlet (9) where a first heat medium is introduced into the housing (2) at a higher temperature than the aforementioned low temperature and an outlet (10) where the first heat medium is evacuated from the housing (2).

Abstract: A heat exchanger with a housing (3) that contains a set of channels (12); an inlet collector (4) having an inlet collector chamber (9) with an inlet (5), wherein the inlet collector chamber (9) includes first flow distribution means (10) configured to distribute a flow originating from the inlet (5) evenly over the set of channels (12); and an outlet collector (6). The first flow-rate distribution means (10) consist of a single body (15) that comprises two flow-conducting surfaces (16), which are symmetrical with respect to each other according to the first plane of symmetry and the second plane of symmetry, and which two flow-conducting surfaces (16), as seen from the inlet (5), are inclined downward in a first direction perpendicular to the first plane of symmetry and/or in a second direction perpendicular to the second plane of symmetry.

Abstract: Drying device for drying compressed gas which includes at least two vessels with regenerable desiccant and an adjustable valve system which is such that a vessel can dry compressed gas, while the other vessel is being regenerated, whereby by regulating the valve system, the vessels can each in turn dry gas. The drying device includes a regeneration pipe for supplying a regeneration gas which runs from an outlet for dried gas to the valve system, and in which heating means are provided, whereby the drying device is provided with a return pipe for returning the regeneration gas to an inlet, running from the valve system to an inlet pipe which connects to said inlet and in which a venturi ejector is mounted, to which said return pipe is connected, and that regulating means are provided for regulating the flow of gas going through the venturi ejector.

Abstract: Compressor system provided with a compressor device with at least one compressor element with an outlet for compressed gas, an outlet line connected to this compressor device for the compressed gas, and a dryer connected to said outlet line of the type using a drying agent or desiccant for drying the compressed gas from the compressor system. The dryer is provided with a drying section and a regeneration section with an inlet and an outlet for a regeneration gas. A regeneration line is connected to the inlet of the regeneration section. The regeneration line includes a first heat exchanger for heating the regeneration gas. A secondary section of said first heat exchanger forms a condenser of a heat pump. An evaporator of the heat pump is provided in the compressor system.

Abstract: A computer-implemented method of remotely managing a compressed air distribution system by means of a control system of one or more compressors. The method is iteratively repeated, and includes the steps of sharing respective statuses by the one or more compressors with the control system via a shared communication bus, controlling the one or more compressors in parallel via the shared communication bus based on the statuses and on a required pressure and/or flow rate, and when a first device is connected to the compressed air distribution system, detecting the first device, integrating the first device. The integration is carried out simultaneously with the parallel control of the one or more compressors.

Abstract: A computer-implemented method for detecting condensate in an oil system of a compressor, having an inlet and an outlet. The method incudes the steps of: determining the humidity at the inlet and at the outlet or downstream of the outlet of the compressor; determining the amount of water vapor that enters and exits the compressor based on the humidity determined at the inlet and the outlet or downstream of the outlet; determining the amount of condensate that remains in the compressor by determining the difference between the amount of condensate that enters and exits the compressor; storing the amount of condensate that remains; and repeating the aforementioned steps at regular intervals and storing the amount of condensate and how long said condensate remains in the compressor.

Abstract: The non-lubricated compressor (10) for compressing a gas, comprises: a stationary stator (12) with a housing (18) comprising a rotor cavity (20) delimited by a bottom wall (22), a top wall (24), and a lateral wall (26) connecting said bottom wall (22) and said top wall (24), a rotor element (14) arranged for rotation about an axis (z) within the rotor cavity (20) for compressing a gas therein, a self-supporting sealing element (16) arranged within the rotor cavity (20), wherein the sealing element (16) is made of an abradable carbon material, and comprises a wall portion (34) arranged on an inner surface of the lateral wall (26) of the rotor cavity (20).

Abstract: A method for supplying compressed gas via an assembly (1) having a plurality of liquid-injected elements (6, 8) for compressing gas, wherein the method includes providing a first liquid connection between a first liquid circuit related to a first of the plurality of liquid-injected elements (6) and the second liquid circuit related to a second of the plurality of liquid-injected elements (8).